As his favourite dessert is custard at the minute I have found myself making custard a lot to put in them. We use Coconut milk (Koko) and Bird's custard powered to make custard for Nate. I find that you need less milk when using coconut milk but sometimes need to use a little more custard powder and you have to keep stirring the custard while it cools or it can become lumpy.
Another favourite here was apple and strawberry puree. One apple to 5 strawberries cooked down for a while and then pureed up.
Washing the pouches was very easy, I ran hot water through the ziplock opening and then through the spout to get rid of the excess food and didn't have to use a bottle brush although I did just to ensure they were clean and then 'hung' them to dry on our washing up dryer. The only negative I found was that sometimes even if you only fill to the max fill line some food can still come out when zipping it up, although I got better at not letting that happen the more I used them. You can find them here at www.nomnomkids.co.uk
We were sent these to review, all opinions are my own.