Pull the liners out of your boots and be sure everything is completely dry. If they smell like dirty socks, let them air out. If that's not enough, hand wash, then dry thoroughly. If there's mold, put the dry liners in a plastic bag with mothballs, seal shut, let them fumigate a week or two, then air them out very well. If they're smelly this year, next year use a boot dryer after every ski day.
Wash the liner in your helmet if it's stinky. Remove and hand wash the liner & ear pads if they are removable. Otherwise hand wash the complete helmet.
Get your gloves completely dry. If they're stinky, fabric gloves can be washed on gentle in the washing machine. Expect the linings to get pulled inside out, and expect it to be a pain to get the liner fingers back into the shell fingers. Anti-odor foot powder works pretty well inside gloves to de-stink them as well to make them easier on & off. Apply suitable waterproofing on fabric & leather gloves.
Hang up your parka & pants. You might wash them with soap intended for outdoor garments, then apply your choice of waterproofing. I do this in the fall to keep the waterproofing as fresh as possible just before ski season.