HP 28 with battery corrosion

[Geoff Quickfall]

Agree with Paul!

Try deoxit and some mechanical cleaning with a stiff artist brush that fits into the battery compartment.

Work the brush into the compartment first, shake any debris out, repeat many times. Then introduce a drop deoxit onto a brush and paint the springs with it.

OR

try this :-)

Read the whole posting: Shucking the clam shell