Do I rinse slate (and how) before putting it in the enclosure?

[aFunnyThingHappened]

After one abysmal attempt at ordering slate that arrived as both Definitely Not Slate and way too dusty to be safe (since returned and refunded), I have since gotten proper slate delivered this morning...but it's still dusty. I'm gonna guess I rinse it off, but is there a special process to make sure all the dust gets washed off, do I have to do something to inhibit potential mold growth, and how do I ensure it's dried properly?

First timer here, terrified of doing wrong by this little guy. I've had him a day and I already love him.

 

[Maz]

Hi there. If it's slate it's waterproof so it's fine to just rinse it off and leave it to dry

 

[aFunnyThingHappened]

Hi there. If it's slate it's waterproof so it's fine to just rinse it off and leave it to dry

Thanks! Just wanted to make extra sure first