Pingi Dehumidifier Car & Home LV-A300 - Absorbs Moisture Condensation Damp Keeping Windscreens Clear - 1 Reusable 299g Bag - £7.68 @ Amazon

Do what I do.
Clear the windscreen with the heater so that the moisture is in the air and then open the windows to let the moisture get blown out.
Do your driving with the dial on feet and windscreen so the carpets get heat aswell and just before the end of your journey open the windows again to let moist air out.
I very rarely have condensation on my windscreen and that's only when I forget to open windows before I end my journey.

They do a two pack for £13.52 which is a better deal on Amazon

Cheaper at Euro Car Parts for the same item

I have read that you can do the same with cat litter crystals, no idea how you put that in a bag that can absorb water though

Got one of these for my daughters car and it works really well! Was a bit sceptical when ordered but no more misted up windscreens. Deffo worth getting one

This or make your own with cat litter from Aldi or Asda Smart price. Stuff it into an old sock or into tights. Works just as well

I had one and it was absolutely useless to be honest

I have 4, which have been great for a few years. 2 on dash and 2 above boiler, swap them weekly. Some microwaves don’t like them so I just leave them on top of boiler

Looks decent but a few reviews show it exploding in the microwave which is a bit worrisome - has anyone already got this? any issues? thanks!

Mist or condensation?

As 'mist' solution - fine, but the car's blower will take care of that in 30 seconds. As a condensation solution they really do not work. If you think it though, it's obvious why.

Cars leak air and heat massively. You add to all that moisture every car ride and loads of it will condense when the due point is guaranteed to be reached each morning and evening. Once your car is damp or wet with condensed water these things are useless (that happens within a couple of days) because they are wet and stay wet.

They can take care of mist - like the condensation when you breath onto a mirror - which evaporates very easily I to largely dry air, but could not cope with the 25-50ml of water I accumulate twice a day.

The stitching came undone and got mess in the car. Then you have the problem of how to dry them, and where?
Your now damp house? Do you really want to transfer those wet car conditions to a room in your home? They take a long time to thoroughly dry out and be 'effective' again - the only chance for that is summertime.

Karcher window vac collects 25-50ml morning and night after I've poured warm water from a clean milk carton to soften up the frost/ice. Changing the air with an open window at the start and end of a journey helps keep it down too. It makes so much more sense. (edited)

Don't have a microwave, what are my options to "renew" it instead?

This is expensive but they work well. Using the 350g bag last year on my dash, window didn't fog up all winter.
So far this winter it has fogged up every day in the last week without one so just purchased the 1kg bag for £9.99.

So it takes moisture out of the air and you have to microwave it to release the moisture back into the air... I'm confused

Fleabay half the price

Save your money, I had this on my Range rover Velar and on the wife's panamera turbo and they didn't really make a difference.

Lots of recent reviews aren't positive

Really weird how personal experience of these varies so much

May be quality control.issue or possibly those with bad experience have some water ingress into car so so higher moisture level ?

Still on fence whether to buy !

I have this exact one & it's rubbish!

I've been using these for a few years now in my convertible and they are quite good at reducing misting but you do need to recharge them frequently and let them dry out for a while after taking them out of the microwave (as they will still be steaming). You really need to use 2 or three of them to make a difference. I bought them from Amazon for £5.01 and £6 in 2018/19 and as far as I am aware they were not on offer at the time. (edited)

I have tried multiple of these and found they did nothing at all.. Not voted just feeding back my experience.
Would I buy again, NO

I've used one, and it's hard to tell how much it helps. Whether the screen mists, and sometimes freezes inside, depends on more than just the temperature. For instance, if the air in the car is warmed by the sun prior to temp falling then condensation will happen as the glass cools. If you do try the bag and dry it in the microwave keep an eye on it and cancel at the first "crackle". I weigh it to tell if it's dried out, but I'm obsessive! This problem seems to be prevalent in vw's, is this true?