I haven't used wood shavings since the CCT started recommending against them due to some piggies having respiratory problems related to the wood dust.
Griff and Malcolm are in a cage that's 1500 x 700 cm in the living room. So, I couldn't abide bad odours. I put down a good layer of newspapers and then lashings of meadow hay. I find I only need to clean them out about every 5th day as it can start to smell like a barn (but the barn smell is better than what Herbie cat leaves behind in the litter tray every day!) :^-
Sometimes when they get a bit, urm "fruity" you do get that unpleasant smell, but thankfully, it doesn't last long. Bathing every month or so helps as well.
I tried Carefresh once, but found the cage needed to be changed more often due to the smell.