Old, crumbling grout can be unattractive. As it is not recommended to attempt to add new grout over old, often the only option is to remove the grout and start over. However, grout removal is not an easy task. Luckily, professionals and DIYers can find many products containing chemicals for grout removal. These products can also be used to remove grout stains from tile and brick. Some chemical products require safety gear, while others do not.
Defusco Industrial Supply: Grout Removal
This chemical mix aids the removal of epoxy grout and lime grout. A special feature of this product is that is a 100% biodegradable, nonharsh colloidal mixture that meets the new USDA standards. It also meets professional standards of efficacy. However, this grout removing chemical requires no need for protective equipment like many similar products and is nondamaging to surfaces that are delicate. Besides grout removal, this product has six other purposes, including removing caulking that is hard and old. This grout removal product comes in one gallon bottles and can be purchased online.
Muriatic acid (a form of hydrochloric acid) is a tool brick builders sometimes use to remove mortar. The same or stronger chemicals can be used to remove grout. To purchase this chemical for grout removal, consult your local hardware store or building supply store. This grout removal chemical is particularly harsh unless used correctly. Do your research or consult your local professionals.
Aldon Grout Residue Remover
A less harmful chemical concoction, this product is said to be as effective as muriatic acid but without the potential dangers and other downsides. The grout removal properties of this chemical product are best immediately after grouting. However, it is also an effective removal tool years later. Additional applications may be required for older grout. Available to purchase online.