This thread is so long I have absolutely no idea how to see if this has been said before. But I use vinegar/Tea Tree EO/Lavender EO/water to wash everything (the recipe that was given earlier). However, it was not removing the soap/dirt scum. All I did to remove soap scum was wipe a generous amount of baking soda over the scum (wiped because it's hard to "sprinkle" on the sides
), and immediately the scum wipes completely off!
Baking soda is "cleaning gold"! (I still use the vinegar/EO mix to disinfect.)