I still haven't managed to convince myself to bring the brush inside the house - let alone use it.
Its smell is unbearable.
It has been sitting on the balcony in a protected area for a month now and it doesn't seem to lose its smell.
If this problem ever gets resolved, I might attempt to clean the radiators as well.

It does a job that cannot be done in any other way. The hair could indeed be the same throughout the length for better results. Also, many hairs come off during the first use, but then there are not so many losses. Mine didn't smell at all.

The problem, besides the fact that the hairs fall out with every movement, is that this rod that is supposed to go inside the radiator bends. Good as an idea but not made from good material

If the bristles were the same everywhere, it would be much better. AE in general is very convenient and quite flexible...

Very good product. The radiators were fully cleaned. Once with cleaner and water, and the second time only with clean water. Excellent result.

If the diameter of the bristles was the same throughout its length (as the larger one), it would be better. The larger diameter of the bristles does not reach the bottom part of the radiator, so it does not clean well from the middle and below.

Very good!! The radiators literally shine! It takes a little more time, but it does a good job!!