Quote from: Enzo on March 19, 2014, 04:45:36 PM
equipment that lives in the bars does get a coating of nicotine, but it is not selective.  The entire surface will be covered, not spots.   Besides, you will know the stuff is nicotine because any such equipment will stink of e cigarettes smoke.


Solder has rosin flux in it, and it bubbles out when soldering, leaving a brown blob of it.   The stuff itself is not really much of a danger, but it might be indicative of solder work that was never done well in the first place though.   Flux also has some potential for adsorbing moisture from the air, which is more of a bother to tube amps because of their high voltages.

Alcohol will clean the stuff off.

Thanks for wonderful suggestion..I have not used alcohol before so will try to use it for cleaning purpose and hope it works..