Does anyone know if and how you can wash the topeak bike packing bags, specifically the top loader and rear loader?
I use Nikwax Tech wash on my pannier bags.
Do it in the bath so you've got plenty of working room.
Just make sure you rinse them well and get them straight on a clothes line on a warm sunny day.
If it's just the inside, an occasional wipe with a non-oily cleansing wipe goes a long way.