For that you need a Prevost. Their s*** don't stink.
Just kidding, the wally world stuff seems to work for me, but I dump and wash after every weekend trip.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle
https://wersquared.wordpress.com/