Umm..All I know is, 95% platinum with 5% Ruthenium, no copper added.
So a no go on the ultrasonic cleaner then. Any other suggestions?
Trying to find a jeweller a couple of hours from us who has the experience with Platinum, so I can have it cleaned/buffed up when I'm around there.
I've been reading a U.S forum where the ladies there are putting their rings in a mix of different things, even cleaning with windex and toothbrushes I don't think I could do that to any ring...

eta: Thanks for the replies Queen
How often can you go to a jeweller? TBH it is not going to need cleaning THAT often. Just take care of it, take it off when doing dishes (unless wearing gloves) gardening, do not wear in pools, beach etc
I would probably speak to the jeweller who is making your ring, but I *think* you just use a polishing cloth.
Oh what 'colour' jewellery do you wear now? Gold or Silver?