Panasonic DMR-PWT550GL Service Manual page 69

2. Apply one drop of ethyl alcohol or isopropyl alcohol on a clean cotton swab.
(Always use a fresh cotton swab free from any additive or chemical.)
3. Lightly put the cotton swab on TT, and wipe it by turning by your finger.
(DonÌt touch the surface of TT when you turn it.)
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