HP 33E Repair Advice

[kusmi]

(03-26-2015 03:30 PM)Den Belillo (Martinez Ca.) Wrote:  I've had good luck with vinegar & a brush, then a wash with alcohol, then a three day drying off before i power it up.

You say you even used vinegar on the circuit board? If so, i will try that too (if I see green stuff on it, once opened)