Handheld VHF160 troubles....

[4runner]

I’ve got a WEST MARINE handheld WHF160.

It’s been a great unit for many years.

Recently, the Volume/Squelch button has been acting up. Sometimes it would need to be held 5-10 seconds before allowing adjustments of vol/sq.

Now, it will not allow any adjustments at all.

I can hear the button clicking as I press it , but nothing happens.

I’ve charged the battery, removed and reinstalled the battery and I’ve scrubbed around the button with running water and a toothbrush. It’s waterproof.

If it wasn’t a waterproof vhf, I’d take it apart and clean the button contacts with alcohol and a q-tip. Due the need for being waterproof, I’m hesitant to disassemble it.

Any suggestions before I disassemble???

Thank you in advance!