Welcome to the forum and congrats on your first big toy
I don't want to discourage you right away, but there is no good way to clean (as in sanitize) PVC toys.
It's a good start that it's phthalate free, but the other major problem with PVC is germs because it's a porous material.
Here's an informative article/blog post about sex toy materials I found a few years ago
https://dangerouslilly.com/toxictoys/
The safest way to use your toy would probably be to prevent getting dirt/germs/whatever on it as much as possible by using a condom or something. Not a great solution and costly in the long run, but an ok way of damage reduction with PVC toys.
As for storage: Don't keep it in contact with other things made of PVC as that makes them degrade really fast. The same goes for oils and oil based lubes on PVC, which will trigger that same degradation of the material while it's inside of your body. You want that to happen a little a possible.
As I said above, I don't want to discourage you early in your journey. It's not the end of the world, it's not gonna kill you. It's just a bit of a health risk (especially in the long run, though some people get immediate reactions like a burning sensation) that you should probably avoid with your next toy.
The good news is that people usually outgrow toys pretty fast as they start stretching. The 2.2 inch diameter you mentioned in your other thread might feel huge now, but since you decided to make a account on this board, it probably won't feel that big a year from now
So enjoy your toy as it lasts and once you outgrow it, get yourself some bigger silicone toys. It starts getting pricy at huge sizes, but your first upgrades from 2.2" probably won't break your bank.
Happy pounding!