I’m getting ready to do my first Ahhsome purge/drain and fill. Any pointers anyone has for this is the first time doing this process for me. I’ve seen a lot of posts with many different ideas like using a shop vac to vacuum the dirty foam or doing the purge/ draining then refilling running it for a while then draining it again. What about the shell? Do you use some sort of cleaner or just wipe it dry? Just looking for some good advice. Thank you in advance.