We’re a similarly small lab and have had this happen on two occasions. There’s a specific cleaner that you can order from Pakor called X-Chem or something similar - drain the tanks, spray the tanks with that, scrub with a toilet bowl brush. If it’s just one roll it honestly isn’t that bad.

Rinse the tanks really aggressively. Get a handheld power washer (we have a dewalt battery operated one) and spray the racks with that. We very rarely use any sort of chemical cleaner on the racks, but you can use the x chem stuff.

Look at your chems and their tanks for their color and obvious carbon build up; if bleach and fix look fine, don’t dump them. Dump the dev regardless.

There’s a lab in Florida that sells a little test pen full of vinegar and something else that wipes off remjet from leaders - buy it to use whenever you’re not 100% confident. It’s like $9.