I hope you have better luck than i've been having. I did clean the frames like you mentioned and although it did stick initially it soon peeled off as soon as it tryed to use the window and part the velco. Please let me know how you get on.

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One window done

Materials used:

Cardboard (my second favourite material) to use as the frame
Staples
Fiberglass flyscreen (£12)
Brown parcel tape (my favourite material)
Strong self adhesive Velcro off Ebay (just under £4)

To give you an idea of size, this screen measures 100cm x86cm the other one is slightly smaller.

We cut the cardboard in strips 2 inches wide, cut the screen to size and stapled it to the first card board frame.

Then we put the second frame on top of this so all staples were hidden safely, then taped it all together with the brown tape.

The last thing to do was cut the Velcro so each corner of the frame had two pieces joined at a 90 degree angle. Then stick the other part to it, peel the backing off and stick to the window!

Ta Da!

Cost for two windows less than £20, and time taken to make the first one ... about 30 minutes.

It's on right now with the window open, and this is the first time I have felt a nice cool breeze in weeks! I even have my pedestal fan turned off

Thanks again OP for reminding me to get this sorted

Oh, and we used tape and cardboard as we couldn't be bothered to use anything else Too time consuming.

But I might get some white masking tape to put over the parcel tape so it looks prettier The double cardboard frame is plenty strong enough though.

thats great well done! I jealous I want to make one!

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Well here's my screen. I think i will use the flyscreen material next time although flies are not a big problem they are a great to chase around the house Having failed with the velcro we re-inforced the edges with thin strips of wood inside the material edging and used hooks screwed into the window frame to fix it in place.

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Just wanted to add, as I've read a few are having trouble with the velcro ... That one I linked to is very strong, and it has stuck to our windows really well. In fact Chris couldn't get it off again without a struggle when he stuck a bit on wrong

Seriously, I've tried some myself in the past that just slide off or that just aren't very sticky, but this stuff is ace! It stuck to the cardboard no problem to, but I did staple it a couple of time to be safe as well.

That Looks BRILLIANT!

Fish pond netting! Of course! Will try that one to keep the kitten in.

Mrs P made similar screens last summer when the cats were still kittens. She used steel mesh that you buy in 1m square sheets.
Not that big heavy mesh; it must be 1mm diameter wire and 10mm aperture. She used the sticky baced velcro but intermittantly so it can easily be lifted away from the windon when we need to pull the window shut.
The mesh is rigid enough so that it doesn't need a frame or need velcro all around.

Cats haven't escaped yet anyway but they may just be patiently waiting for me to leave my hacksaw lying around......

thanks for the hints Indysmamma.....I had the netting and the velcro already, but used a border of strong Duck tape folded over the edges to make a frame to which I could stick the velcro. ( I dont have a sewing machine ) It works just fine.

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Nellie Paddy Mitzy Milo Peggy Murphy

Millie and Monty, the White Devils!