Use a wrench to remove the nuts and bolts that hold the trim panel (the panel that encases the cassette player) onto the dashboard of your Toyota. Pull off the dashboard trim; the cassette player should now be easily accessible.
Dampen a clean cotton swab with rubbing alcohol and gently wipe the tape heads, the silver square components, on your cassette deck. Repeat this until a cotton swab comes out without any residue left on it.
Use the same method to clean the capstan and the guide posts. Repeat a number of times until the cotton swab comes back clean.
Fill a small bowl with tepid water, and add a drop of dishwashing liquid. Mix thoroughly. Dampen a cotton swab and use this to clean the pinch roller, the rubber circular component, in the same manner as the other parts; do not use rubbing alcohol on the pinch roller because it could cause the rubber to desintegrate.
Reattach the trim panel to your Toyota's dashboard once you have finished cleaning your cassette player.