Love the idea, and fluids are always a pain for me, I have 6 stations to take 6 different fluids.
Right now, I am focusing on petroleum gas, I over load the requesting station to make leave with gas still on the train.
I get "no clean up station found" no matter what I name it, symbols used, or singles.
I am playing on a MP map and I have a L<CCCC<L setup

Am I missing something ?

I've added a section with sample stop names.

Train stop to process petroleum could be named like this: [virtual-signal=ltn-cleanup-station][fluid=petroleum-gas], or visually:

If it doesn't work, there might be a bug :D (this mod is two days old after all)
Give it a go and let me know if it worked ;)

Bingo! I misunderstood how to name them. Time to do the rest !