How Can I Block People Seeing In My Garage Window But Still Let Light In? (UK)

I'm in the UK & looking for something to stick on the inside of a garage window to stop people seeing in, but still let light through. I've seen a few options like static cling or frosted window film on Amazon, but a lot of the reviews aren’t great. Has anyone found something that actually works well & lasts? Would be great if it’s easy to apply myself too.