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I was more concerned about the detergent discolouring or harming the plastic
Nup. The color is all the way through - there shouldn't be a drama. Boil the kettle, pour the water in a cup with a little normal washing up detergent. Wait a bit until your wife can put her finger in it, then chuck in a couple of lego. Stir. If no damage go for the dishwasher (on the shortest cycle).
(Disclaimer: I work with polymers, more particularly PVC, but I also produce alot of stuff made from engineering plastics)
I don't speak Idiot - please talk slowly and clearly
That's funny, not because you're being a smarty pants but because I'm always being told that I've loaded the dishwasher incorrectly. Did you know that baby bottles have to have something else next to them so they don't flip?
if you buy it new, they say that you can wash it at 30°C in your washing machine. I would not tumble or centrifuge it. Put some lego as a test in an old pilow cover. That should work. I would not put it into the dishwasher. The dishwasher cleaner is very "strong" and aggressive.