Acetone is probably the one of the most 'violent' paint-removers you can buy as a a consumer... even as nail polish remover, it has now been generally replaced with less reactive substitutes, though you can still buy the original stuff.
Problem with Acetone is that it attacks plastics and many other materials, so should really be used only on unpainted metals and glass... in fact it should best not be used al all.
I can see how adding Acetone to petrol may help remove varnish and other deposits from the full system, but it may be harmful to some elements in the system such rubber seals or paper filter. As said above I would stick to conventional fuel system cleaners such as Redex / STP/ Forte, which are generally based on turpentine and in the right dosage. I will take longer to get there and will require repeated use, but it is a safer way of doing it.
And ultimately, if the injectors are badly clogged, no fuel additive will help and you will need to remove them and have them professionally cleaned suing ultra-sonic cleaning equipment.