From Kester, 232 and 285 RMA are good for assembly. For rework, sometimes a more active flux like 44 is useful. These all clean up pretty well with IPA, although MG 4050A is slightly more effective. You might try it on your 245 flux, too. If the commercial cleaners are too expensive, you can also add a small amount of heptane (Coleman fuel) and acetone (like 5% each?) to IPA and it will clean much faster.
There are lots of companies making similar products: for solder, Multicore, Ersin, Alpha, MG, Chemtronics, etc...
For cleaners try Techspray, Electrolube, Chemtronics, ACL, Microcare, etc...