I'd empty it, take a wet rag and wipe down the glass, and filler back up. Keep in mind, you aren't starting over. The bacteria is on the stuff and in the filter- not in the water- so just empty, wipe, and maybe do another change in a day (just to be safe). Surfactants aren't a joke when it comes to fish and their gills. Two full dillutions should be on the safe side and be ok.
It might slow you down a day or two in the overall scheme of things.