YES! That is exactly it! You definitely have to immediately scrub out the tub for safety and that totally negates the relaxed good feeling after a soak. So not worth itWhen I visit my son, DIL & granddaugher, I have to search for the suction-cup bathtub mat prior to taking a shower in my granddaughter's bathtub because of the oily-tub syndrome. I fell one day just stepping into the tub;