I have grungy permanent bathtub antislip stickers. How do I clean them

Easy Off No Fume Oven Cleaner in the BLUE can. Spray it on and let it liquefy. May need some scrubbing. Wear rubber gloves. Rinse well.

I would remove them and put new ones in. I am concerned that if they are that dirty that they may have lost their effectiveness. I would hate to see you fall!

Here are a couple of ideas.

https://www.youtube.com/watch?v=9KGMAhrIT74

https://www.youtube.com/watch?v=VXO9mO8AufM

I would also remove them and replace them. Goof off and Goo Gone are great for removing residue.

I agree, i've had success with goof off

See all above advice or coverthem with hot water and Bio washing powder and let them soak overnight, then scrub them before letting water out. Repeat if required. Rinse the bath with clean water after.