[Edit with what actually worked] I found out that the fleas were in the slop sink. Once I scrubbed that daily, my issue was soon a thing of the past. The key for me was to scrub all areas thoroughly where they may be. I used a rough thin green sponge and threw it away after each scrubbing. I got 5 for a buck at the dollar store and they worked great. I didn't have to deal with carpet, so I can't speak to that, except that a beater bar seems to work for others as long as you clean the canister/or throw away the bag after each vacuuming.
[Original post - Spoiler alert: It was not the accordion exhaust tube for the washing machine, it was fleas in the actual slop sink that the tube emptied into.] The water exhaust hose from my washing machine is the accordion type and is harboring fleas. (I only figured this out three days ago.)
I thought I was getting to this end of my flea ordeal, but they kept popping up. It dawned on me that the washing machine exhaust hose had a build in trap (u shaped loop) and so I put some flea killing shampoo,diatomaceous earth, and water in there and got a bunch (30 or so) when I did the next wash.
This is the last place I have them (I think), so I am looking for a way to eliminate them from this hose. For the past 3 days, I've filled it with my flea killing shampoo,diatomaceous earth, and water concoction and closed off the end of the tube with some saran wrap and a rubber band, but I still get a few when I do a wash.
Has anyone else faced this? Any ideas on how to put the final kibosh on these last few remaining fleas? I also one or two creeping up from my slop sink and they keep coming back despite my concoction and best efforts (but only in the "slop sink" that I use as an exhaust for my washing machine). Thanks!