If you use funnels in your garage or workshop for filling oil, gas, herbicides, pesticides, etc., you waste a lot of time and money if you clean them after each use. To prevent dust and insects from sticking to them, just put each one into a different color shopping bag and close them air tight with a twist tie. You can hang them up on nails by their handles, and even label each spot.
By Helmut
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Related:
Organizing Funnels