Reddit reviews Caraselle A Pack of 20 Zensect Bouchard Moth Proofer Balls with Lavender Fragrance

I had a moth infestation, and cleared them with these mothballs which were very effective - IMO it's not the cost of getting rid of the moths you need to worry about, it's the landlord realising the damage to the carpet and holding you to blame for it.

If you want to play hardball you could find a jumper or something they've damaged and write a letter before action claiming its cost from the landlord. If you succeed at www.moneyclaim.gov.uk then you have proof he's liable, and then you can use that if he subsequently tries to take it out of your deposit.

More likely he will respond to your letter and argue about it - if he acknowledges the moths were present when you moved in you can say something like "since you have acknowledged the moths were present when we moved in we will, as a gesture of goodwill, drop out claim for the jumper on the understanding that you will not be claiming any of the considerable moth damage to the carpets from our deposit".

I'm not a lawyer by the way, this is just my opinion.

Use plenty of the orange balls, replace them when they go white. Find any eggs in the carpet (feels a bit like dry sand) and hoover them up as best you can. I would find their cocoons on the wall and did;'t realise what they were at first - I also made the mistake of relaxing my vigilance after the first wave, and they came back (presumably because some remaining eggs hatched). This happened within a few months, so I think you'll get them all if you make sure to put down mothballs in all the affected places for a year.

They damage wool carpets dreadfully, so I'd expect the landlord to try and get you to pay for it.