@kiwi2023 no need to wash and dry
If you wash and dry a few then you could actually encourage asper spores to come from surrounding area and attach as you caused a damp environment.
Keep Kiki's food in an air tight container never in direct sunlight we don't want it sweating. Also never buy huge amounts check its use by date same as you do for human food. Things that come in air tight packages like Harrisons treats etc people buy a huge load when its on offer problem is once opened they forget it has to be used within a certain amount of time of opening.
I do buy sacks of feed but then again I have more birds than the average bunny rabbit. So to check my seed is actually nice and fresh regardless of the use by date on the sack, I grab a handful and sprout it. Fast sprouting time of all the variety of seeds and I know its fresh stock in the bag Slow sprouting or only a couple of items sprouting I'm already thinking duff seed been stood too long somewhere and I get rid.
It's all about logic.
The bird will eat regardless of if its good or bad it can't go out and forage for what it needs so the option for them as they graze all day long is pick out what they can that's good but forced in to eating what's left because its that or starve. As their keepers its up to us to ensure that we purchase is the best we can get to ensure their healthy living standards.
Doesn't matter how fancy a bag or high purchase price that doesn't make the contents any better if its been stored incorrectly in a warehouse somewhere. Hence purchasing something like TidyMix I always purchase direct from the maker rather than an agent. It makes sense to cut out as many places in between as possible. Plus TidyMix is human grade meaning if you fancy a nibble you can too quite safely....... just watch the chillies if you eat anything