Quick Answer. A bad mass air flow sensor in a vehicle makes starting difficult and affects the performance of the engine because he engine-control unit uses data from the MAF sensor to balance the fuel ratio the injectors deliver to the engine.
While porcelain tile boasts exceptional durability, there are few products and techniques you should take pains to avoid: 1  Never use a product containing ammonia or bleach (or any type of acid-based cleanser); these can alter the tile color and/or stain the grout. 2  Never use oil-based detergents or wax cleaners.
Mildly abrasive bleach cleanser. Scrub brush or sponge. Towel. Rinse the porcelain tub thoroughly with warm water. Apply a mildly abrasive bleach cleanser to the stains. Allow the product to sit for at least 10 minutes. Clean the tub with a wet scrub brush or sponge, paying special attention to the stained areas. Rinse the bathtub thoroughly. Dry the tub with a towel.