How do the non electrical parts of a gamecube controller respond to ultra sonic cleaning(and some other quistions)

Bi i have a ultra sonic cleaner and i wand to use them on 8 gc controllers i got gifted they are quite dirty.

I am specially cononcered with how the rubber pads respond since this will be the 3th time i use the cleaner and the first time i use for someting i care abouth

Wil this and the other parts be fine

Also i wont be doing the wire and electrical boards

Mine sulution in the cleaner is normal focet water (from the netherlands) dusty some eco friendly soap evreyting cleaner and a ultra sonic cleaning sulution that green and is quite mild sinse you dont need protection to use it since it safe as long as i dont go in your eye or mouth

Thx for reading and have a nice day

Also where can you find analog tumb sticks replcement for reasonable quility for a cheaper price (2 or 3 of them have damged rubber or its fully off but since i have lots dont need top of the top stuff)

I have the some question as above conserning quility and price regarding ruber pads the butons go on and the analogstick module(are there hall efects/ tmr for a resenole price? Live for the ps4/5) since i have some with lose analog sticks and sone with butons that dont work or need to be puched relly hard.