If the stem itself is clogged, a thin, blunt object can sometimes be used to gently clear the path.

Pros:

are wedged under tires to provide instant grip when wheels are spinning. Devices like Trac-Grabber Go to product viewer dialog for this item.

: Apply a lubricant like WD-40 to the area where the boot meets the tire. Focus on the back part near the spike and wipe it along the side to help the boot slide off.

The Ultimate Tire Blocker for Safe Vehicle Parking - AliExpress