Hello Vexedwaffle and welcome to the forum!
(I am laughing at that name and wondering if there is a story behind it.)
I have had great success recently in restoring several of my old castle sets, which had darkened and yellowed over 25 years. Can I ask what you are looking to restore on your own sets?
Thank you everyone for the kind greetings. For those wondering about my name. It is a gamer tag I use that just made me snicker. During multiplayer matches I used to say the same tag line taken from and adjusted for waffles from Winston Churchill. "We shall fight them in toaster, on the plate and on the fork. We shall never surrender!"
And now I use it for everything. lol.
The castles are coming along, I'm actually just ordering replacement parts from playmobil. So I'm excited to get them back close to their former glory.