Here’s my suggestions after dealing with Cyanobacteria and contamination. I beat a pathogen that makes people shelve their cloner or ditch it entirely. Read over this thread to see ideas that pertain to your circumstances.
DON’T share measuring tools! Get yourself separate spoons. I learned this from the creator of Permaklone collars.
IF you have high alkalinity, BUBBLE (bleach is good, but I use even powerful Oxine) and add a few drops to a few gallon bucket. RINSE only with tap water and some soap. CHANGE it when sediment sits on the bottom.
IF higher temp is the problem, ADD small ice water bottles that will fit. Have EXTRA ready to change out as temp rises and melt.
Product like Rez Clear can also help keep water sanitized, but I rely on PRE BUBBLING water before using in a cloner.