Old topic but persistent problem. I have been throwing out some older silicone spatulas because they come out of the sink or the automatic dishwasher clean, then develop a greasy surface film while they sit in the drawer for a few days. I think it's mostly cheaper ones that get really icky. Some brands--I can identify Mastrad specifically--seem to hold up better.
I can clean it off before use but I can't help thinking that something is absorbed into the material and then leaches out again and presumably this is also happening while the spatula is in contact with the food (ick).
I have been wondering for years whether everyone sees this or if it is promoted by something in my kitchen (water? cooking fats? detergent? karma?).
Anyway, I would love recommendations from people who have experienced this for brands that are more resistant. I think the Mastrad items are very good quality but I would love a couple of smaller spatulas with thinner edges; the Mastrad ones are rather sturdy.
ETA I'm looking at a Di Oro set online but it's hard to tell anything about the edge profile.