You can use dawn dish soap to clean your tub and shower walls:
Get an empty spray bottle and fill it halfway with white vinegar; to get extra strength you can heat the vinegar first before putting in the dawn dish soap. Fill the rest of the way with blue Dawn dish soap; shake to mix well Spray on your tub and shower walls. Allow to sit for a few minutes and rinse away. It will totally melt all the gunk, slime, sludge and other stuff that builds up including a bathtub ring.
A cup of Dawn detergent poured into a clogged toilet allowed to sit for 15 minutes and then followed with a bucket of hot water poured from waist height will clear out the toilet.
Cover greasy footprints on shower floors with a coating of Dawn; let sit overnight. Scrub away the gunk in the morning with a stiff brush.