Glue squeeze-out can be wiped up with a wet rag, but this can drive some of the glue into the wood's pores. A method preferred by many pros is to allow the squeeze-out to form a thick skin (usually about 15 minutes), then use a sharp chisel, paint scraper, or cabinet scraper to remove it. A 1/2- or 3/4-in. chisel is handy for glue removal inside corners or next to mouldings.
If vibration causes nuts to constantly work loose, first add a lock washer, if it doesn’t have one. Or, if there is room on the bolt, use two nuts, tightened toward each other so they lock solidly. You can also try wrapping monofilament fishing line under the nut before tightening it on the bolt. Another possibility is to try wrapping the threads first with the teflon tape that is used in plumbing.