Okay, I had an infection with a batch of wine. It was a waxy buildup, and I
finally ended up tossing the wine. (sigh) Tears the heart to do that,
but...

Anyway, when I emptied the wine I found waxy patches in large areas inside
the carboy, and the same in another carboy I had earlier used to rack the
wine. I've hot-water rinsed them, sanitized them, and scrubbed with a
carboy brush numerous times, but the stuff is still there. The carboy brush
simply scratched through the buildup in thin stripes, one for each bristle.
I don't dare put wine in the two affected carboys, and I hate to ditch them.
Any cleaning ideas that may help? How do I get rid of this residue so the
carboys will be safe to use again?