In the daily operation of the laundry shops, the oil-based stains and protein stains are common. From the grease, sweat, and blood stains on customers’ clothes to the stubborn stains on hotel linens, whether these stains can be removed efficiently and thoroughly directly determines customer satisfaction and the reputation of the store. Insufficient cleaning of the stains and the secondary damage to the fabrics are mainly the pain points of the customer complaints. As a global supplier with 25 years of experience in the commercial laundry equipment field, Kingstar knows the core demands of laundries, so we share professional solutions for two types of stubborn stains and reveal how to achieve efficient stain removal and fabric protection through equipment.
Stubborn Stains Analysis
- Oil-based stains
Oil-based stains include vegetable oils, animal fats, mineral oils, and similar substances. They typically penetrate and spread along fibers with no clear boundaries. As time passes, oxidation darkens their color from light brown to deep brown, so fully oxidized stains are extremely difficult to remove.
– The core treatment for these stains is dissolution + emulsification.
Pure oil stains can be removed with organic solvents such as alcohols and ethers, or with water-based stain removers containing lipase for eco-friendly decomposition of oil molecules.
Ring marks left after treatment with solvent gasoline or perchloroethylene require secondary cleaning via dry cleaning or emulsification.
For stubborn oxidized oil stains, pre-treat with carbon tetrachloride first. For old, set-in oil stains, use a specialized stain remover.
- Protein stains
Protein-based stains include blood, sweat, milk, meat juices, and similar substances. Fresh stains are acidic, while set-in stains turn alkaline. High temperatures and alcohol will accelerate their bonding with fabric fibers, so such stains are especially hard to remove from viscose fabrics.
The key to treatment is low temperature + enzymatic breakdown:
Prioritize using specialized stain removers containing protease, which work best at a water temperature of 50–60°C.
If no enzymatic agent is available, add ammonia + glycerin to a soapy solution, and use mechanical action to soften the stain.
For mixed stains containing tannins (e.g., coffee, wine stains), first remove the tannins with acetic acid + glycerin, then treat the protein component to avoid curing when exposed to alkalis.
Kingstar Equipment Empowerment
Professional satin treatment not only relies on the chemical agents and operational skills, but also requires the precise coordination of washing equipment. Based on the industry logic of collaborative innovation of detergents and washing machines, Kingstar has developed three core technologies to provide solid support for stain removal in laundries.
- Intelligent programs
The washing machine has 30 preset programs, and it can optimize parameters for different types of stains, such as grease and protein.
– Grease stains
It can automatically increase the washing speed to 1200 revolutions per minute and use a strong water flow to break down deep oil stains.
– Protein stains
It keeps the golden water temperature of 50 to 60 degrees Celsius, which is suitable for the optimal active temperature of enzyme-containing detergents. Also, it reduces the washing intensity to avoid fabric wear.
There is no need for repeated manual debugging, and just one click can achieve targeted treatment.
- Mild mechanical forces
It adopts the 270° curled-edge loading opening and a 3.5° tilted outer drum to reduce friction and scratching during washing and prevent pilling and distortion during stain treatment. Paired with a soft tumbling mode controlled by a variable-frequency motor, it dissolves stains and protects delicate fibers such as wool and silk. This solves the industry pain point of damages to clothes caused by stain removal.
- Highly efficient rinsing system
In terms of the possible residual stain removal, Kingstar washing machines have the multi-phase intelligent rinsing programs. By precise water volume control and high-speed dehydration (400G), it can completely remove the residual detergents and solution from the clothes. The low-foam design makes rinsing more efficient. This not only avoids the stiffness and white spots caused by residue, but also saves water resources and reduces the operating costs of the laundry.
Practical Practice
Combined with stain characteristics and equipment advantages, it is suggested that laundry shops to use the standard process of pre-treatment + machine washing + post-treatment.
- Sorting
Staff should quickly identify the type of stains.
– Grease stains
Apply a stain remover in small spots.
– Protein stains
Soak clothes in cold water to soften them.
- Programs
Staff choose Kingstar’s corresponding intelligent programs and add appropriate enzyme-based detergent according to fabrics and stain type.
- Inspection after washing
Apply a local treatment again to avoid excessive washing.
- Drying
Using a Kingstar dryer to dry the fabric at a low temperature (50~60℃) can protect its texture and further solidify and clean it.
Q&A
Q1: Why can’t hot water be used when laundries treat protein-based stains?
A: High temperatures denature and cure protein molecules, so they are harder to remove. The water temperature should be at 50–60°C to match the optimal activity of the enzymatic agents.
Q2: How should laundries quickly treat coffee stains containing tannins?
A: First, apply a mixture of acetic acid + glycerin to the stain to remove tannins. After rinsing, treat the area with a protease-containing stain remover, then use the corresponding program on a Kingstar washing machine for final cleaning.
Q3: How to avoid stain remover residue when using Kingstar equipment?
A: Select the machine’s Enhanced Rinse mode. Multi-stage rinsing plus 400G high-speed extraction thoroughly removes residues. Meanwhile, the low-foam design also reduces rinsing cycles and water costs.
