Steam-clean dingy tiles. High-pressure steam removes grime and mildew from ceramic tile and grout lines. Rent a heavy-duty steamer and use it on any tile surface in the house, including floors, showers, and counters.
Cost: $60 for a one-day rental.
Savings: about $870 over the cost of hiring a professional to retile an 8-by-10-foot bathroom floor.
Bonus: Some steamers have attachments for cleaning drapes and furniture, too.