my shower was getting GROSS because I kept putting off going to buy cleaner, but guess what:

the DIY of 1 part Dawn (my nasty former dude housemate who washed his dishes in his bathroom sink left like a gallon of that blue shit here), 2 parts vinegar, spritzed all over the joint, left to sit for 2 hours (I was making tamales so ended up letting it sit overnight), then scrubbed with a plastic broom (fucking genius arm- and nails-saving hack!) and spray-rinsed down (I don't have a handheld shower attachment but shot my handheld bidet sprayer across the room lol), *really works* incredibly well