Uniden XSA1255 Series Owner's Manual page 53

Cleaning the battery charging contacts
To maintain a good charge, clean the charging contacts on the handset once a
month. Dampen a cloth with plain water. Gently rub the damp cloth over the
charging contacts until all visible dirt is removed.
Dry the contacts thoroughly before returning the handset to the
base.
Caution: Do not use paint thinner, benzene,
alcohol, or other chemical products.
Doing so may discolour the surface of the
telephone and damage the finish.
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