My house is only 4 months old and already Ive got problems with grease spots and discolouration in the grout lines in my kitchen. The grout is an ivory/beige colour. Is there a product available to clean it so I can apply a sealer?Ive tried CLR, Comet, Rust stain remover, etc. and nothing is budging these stains. If I purchased a coloured grout powder (available at the Home Improvement Centre), can it be applied over the old grout? I am not a handy-man. Does anyone have a suggestion (that doesnt cost a lot of money)? Tks. *