After a day, weekend or multi-day trip in the backcountry, ski boots tend to develop a certain funk. If not tended to regularly this funk can evolve into a toxic situation that will result in not being invited on future trips or no one wanting to join you on your trips. Luckily there is a cheap and easy solution.
First step is to get a spray bottle and make a 50-50 solution of plain white vinegar (gallon jug available at the grocery store) and tap water. Next the most important part–after each trip, remove liners and inserts from the shell. Set your sprayer on fine mist and spray one shot deep into the toe of the shell, then a second spray at the entrance to the shell
Next, repeat the same process with you liners (first remove the inserts).
Spray both the top and bottoms of your inserts and set all items out to dry for 48 hours.
With just a few minutes, you can ensure future trips without the funk and your gear just may last longer. This process is also an ideal time to inspect your boots for wear and damage. The shells should be cleaned and towel dried before spraying the vinegar/water solution. If you wear your liners around camp without the shells be sure to brush of any dirt accumulation.