I remember a few years ago I tried a low 3% Hydrogen Peroxide solution on my G1 Star Saber and it didn't quite work out Well I didn't do enough research as I recently stumbled upon this site RetrOBright that not only shows you how to fix your yellowing, but the 101 basics and science to it. I haven't read through it completely, but I have a much clearer understanding of why some of our beloved G1 figures have turned Yellow. It turns out that a lot of plastics in the 80's and 90's, were using (and still are I believe, but back then it wasn't perfected in the way it was used compared to now) the element Bromine. This had a Brown-like colouring and was added to ABS plastics so that under heat, it wouldn't go up into flames, acting as a flame retardant. BROMINE is THE culprit of yellowing more than UV light itself. UV light just acts as a catalyst for the Bromine to separate from its bonds and form with Oxygen, the more of this that happens the more Yellow our figures get :/ The exciting bit. This can all be reversed near 100% and with the correct solutions, tools and trials, we can get our vintage Transformers back to like it was fresh out the factory I have read that Hydrogen Peroxide isn't enough by itself and instead of buying litres and litres of it, you can create a simple paste from household ingredients. Well mostly. The ingredients: - Hydrogen Peroxide solution (this requires some research into what exact solution should be used depending on the circumstances of the item in question) - online or hairdresser supply stores - Xantham gum - purchase from health food stores or online - "Oxy" laundry booster - I'm guessing any type of laundry booster will do. Do some research into this. - Glycerine - purchase from Pharmacies They say that you can use a blender to form a cream, just make sure the blender is thoroughly cleaned afterwards. Follow the instructions on their site as I'm trying a different (lazier) approach and I'll get to that later. Also make sure you wear gloves and glasses, the Peroxide can irritate the skin and potentially cause blindness There are also some ready made Hydrogen Peroxide creams available, BUT do check for certain ingredients added. Terpenes were mentioned as one that should be avoided as it eats away plastics Make sure you check for Terpenes before starting the process! You can prevent the yellowing from reappearing, or at least prolong it by using Armor-all or clear acrylic nail polish. This prevents Oxygen in the atmosphere interacting with the Bromine in the plastics and should prevent from the ugly monster showing its head again. I just bought myself a product called salon care 40 crème and I'm waiting for it to arrive. This is a cream solution that I saw in a video and the results were impressive. It was used on old computers, but I'm hoping it'll work on Transformers too. I'll post up some results on my G1 Star Saber and hopefully it'll be good ones! I would love to hear of others experience with this process on their Transformers and even more so if they have used the particular cream I am about to use. Maybe, warn me on any potential hazards I'm about to face using this stuff.