CRC05103-Case 5103 Quick Dry Electronic Cleaner, 11 oz, 12 Pack

I used this on my cars wire harness connector for the turn signals. my mistake was i didn’t unplug the battery. lights won’t work now. thoughts?

Why is buying this in bulk significantly more expensive per can than buying individually? Shouldn't it be the exact opposite, significantly cheaper

This is a bulk item and is significantly more expensive per can than buying individually? Why?