If a small amount of ferric chloride has seeped into your quartz countertop, you can try the following steps to remove it:
Act quickly: As soon as you notice the spill, try to address it promptly. The longer the ferric chloride sits on the surface, the more challenging it may be to remove.
Safety precautions: Before handling any cleaning agents or attempting to remove the stain, ensure that you wear protective gloves and follow the manufacturer's instructions for any chemicals you use. Open windows or provide proper ventilation to the area.
Blot the spill: Use a clean cloth or paper towel to gently blot the area where the ferric chloride has seeped into the countertop. Avoid rubbing the stain, as this may spread it further.
Prepare a cleaning solution: Create a mixture of warm water and mild dish soap. Dilute the soap in the water, and mix it well.
Clean the affected area: Dampen a clean cloth or sponge in the soapy water mixture, then gently dab and blot the stained area. Continue this process, rinsing the cloth or sponge frequently, until you have removed as much of the ferric chloride stain as possible.
Rinse with water: After cleaning, rinse the area thoroughly with clean water to remove any soap residue.
Dry the countertop: Use a dry cloth or paper towel to pat the countertop dry.
Note: If the stain persists or is particularly stubborn, it's advisable to consult the manufacturer of your quartz countertop or a professional cleaner who specializes in countertop maintenance. They may provide specific recommendations or suggest using a poultice made of a mixture of water and a cleaning agent designed for removing stains from quartz surfaces.
Remember, quartz is a durable material, but it is still susceptible to damage from abrasive cleaners or tools. Always follow the manufacturer's guidelines and exercise caution when attempting to remove stains from your countertop.