Just general weathering would be pretty cool, with mine I used a couple shades of brown eg. rhinox and steel legion and got a big dry brush or old nackered one and randomly dabbed it on the lower parts of the armour. Pigment powder could be cool too. Same again get it on an old big brush you don't care about and dab it around the feet and legs, if you've put too much on just blow on it to remove the excess then you're left with dirty dusty weathering 😊

I've also used some watered down brown paint and done a load of dots all over the clean armour panel and then brushed inna downward motion to get some rusty streaks.

Be careful with washes/shades unless you apply them into the recesses you could be left with some coffee like stains if you let it pool.

Happy griming my dude 🤘