To complete the work you will need a piece of wire with a diameter of 1-1.5 mm (or a large paper clip).
It is more convenient to clean the drainage holes in the thresholds in an inspection pit or overpass.
Sequence of execution
1. Prepare the car for work (see "Preparing the car for maintenance and repair").
2. After opening the door, inject penetrating lubricant into the hinge joints. Lubricate the hinges of the other doors of the car in the same way...
[The source is on the website www.VazBook.ru]

...keyholes of door locks.

3. Apply plastic lubricant to the working surface of the door stops...

...the spring and hinge of the fuel tank filler flap.

Note. To remove moisture from the internal cavities, eight drainage holes are made in the lower part of the front doors, and six in the rear doors. Five drainage holes are made in the threshold pads, and four in the thresholds. Depending on the year of manufacture of the car, the number of drainage holes may be different.
4. We clean the drainage holes in the doors with wire...

...body sills...

...and threshold pads.

