This thing. Driver’s door window.

When I bought my new-to-me car it went down perfectly well, because the force of gravity is not to be underestimated, but returned from whence it came with a speed akin to that of an arthritic* snail. It’s been getting worse and on Saturday needed a helping hand. New motor? No, not usually. Silicone lubricant in the frames front and rear.

Top tip: Google “silicone lubricant” with caution. Mr Google has it in mind that you need this for, er, recreational purposes.

So you buy a spray, but you don’t just spray it randomly because it’ll go everywhere, you spray it on to a piece of cardboard and then slide this up and down both frames repeatedly.

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Result? The window now goes up as well as down, albeit slower.

Applies to all sliding windows, even those not on a Smart.

* Yes, I know snails don’t have joints and are unlikely to get arthritis. Never mind. They’re hermaphrodites and therefore lead interesting love lives.