Tech grout cleaner 32 ounce Tech Grout Cleaner is a safe and easy way to clean dirty grout. This non-acidic formula is odorless and 100% biodegradable so it is safe to use around your family and pets. Spray it on, use the included brush, and mop to restore your grout to like new. E asy to use. Leaves no residue. Odorless and colorless.