is a process that takes top 30 min , and difficulty is 2 out of 10 , u may have to lower your back for a minute.
it may be better products out there but this method always works for me. just be aware that some chemicals out there may stain , so don`t try new things on your own car.
what you need is a metal polish paste , a metal sealant/wax , 1 microfiber towel and 1 terry towel. i have dedicated towels for wheels and exhaust.
after u wash the exhaust tips and dry them put a dime size of metal polish paste on terry towel and spread it ( 3 inx3in is ok) , rub gently the exhaust tips until the grime is remove , same on interior of the exhaust. wipe clean and apply metal sealant with a microfiber towel. now you should have protection for good months and next time when u clean them should be easier.

Products i use :