1. Verify that the joint shaft is not twisted or cracked.
2. Turn the joint shaft by hand and verify that the bearing rotates smoothly and freely.

Drive shaft
Joint shaft removal/installationMazda 6 Service Manual: Electrical parts
Battery cable
Before disconnecting connectors or removing electrical parts, disconnect
the negative battery cable.
Wiring Harness
To remove the wiring harness from the clip in the
engine room, pry up the hook of the clip using a
flathead screwdriver.
...
Mazda 6 Service Manual: Wiper Blades
CAUTION
Hot waxes applied by automatic car washers have been known to affect
the wiper's ability to clean windows.
To prevent damage to the wiper blades, do not use gasoline, kerosene,
paint thinner, or other solvents on or near them.
When the wiper lever is in the AUTO position and th ...