Man these collar gizmos have lots of crevices...

[Jacksdad]

...for poop to hide in!  Twice I’ve rinsed and scrubbed my garmin collar and still there is some bit of poop in there somewhere from a roll session.  Even pulled the entire strap part out.  Ugh!

[bobman]

Yep deal with it on daily basis at least one of mine will do the backstroke thru something nasty