Reviving a 10-Year-Old Bike: Removing & Dissolving Stubborn, Old Grease from Cranks & Freewheels

Hi!

Today I have a problem not necessarily electronic. I got a bike, about 10 years old. I want to bring him back to life. I started undressing, I wanted to clean individual elements, but I have the impression that I am doing something wrong, or the chemicals available in stores do not work. I have old grease on the crank and freewheel at the rear - or something similar. It is so seized that trying to remove it first with water, then pressurized water, water and washing-up liquids will not "touch" it. It looks like old dry mud - because some modes have managed to chip it off, but or someone varnished it or the old grease has thickened and "frozen" the mud that I don't know how to remove it. Of course, I tried the extraction diluent - I wanted extraction gasoline, but they don't. Kerosene - as if she greased this mud and as long as I rub it, I will remove some of this dirt. I also tried some nitro. I sprayed it with a typical chain spray cleaner but it was all for nothing. Maybe someone has some ideas and suggestions ...
Thank you and best regards.

I recommend "EGR cleaner" - for cleaning EGR in cars. It amazes with its effectiveness.

Specific solvents are used for the lubricant.
Try extraction gasoline. Relatively safe for parts and paintwork, it washes away lubricants well.

Oil is good too, and ... engine oil. More specifically mineral.
The oil dissolves petroleum substances well and is easy to remove.

Similarly, denatured alcohol, although it is worse than extractive gasoline.

You can wash it with water, you know what. And with dishwashing liquid, you wash the dishes.
Your bike has parts that are easily corroded. Water is not the best contact medium for them.

Gasoline + stiff brush (or scraper) ...
Soak, wait, scrape ... and so a few times, unfortunately ...
... and then gasoline again with a brush clean.

I do not know if the preparations will work 'wonderfully' on the baked mud with grease - the fact that they may shorten the process, but you still have to ... work.

I used fluid water to clean "roughly". Due to the fact that I did not have access to extraction gasoline, I used an extraction diluent - I do not know if it is the same ... I think I will go to the station tomorrow, for oil ...

You can try roughly pressurized water (quite a bit - some tavern or something), but as Madrik wrote, it is not healthy for the bike's parts, so you need to remove this water immediately, e.g. with compressed air and / or by lubricating these elements, e.g. with crude oil, oil diluted with gasoline or WD-40 ...