WATCH: Are these the world's toughest cleaners?
96-cables ranging in length from 94 to 420-metres are being cleaned – over 24-kilometres in total.
Brave technicians are abseiling from the top of the Queensferry Crossing so they can clean the giant cables and try to prevent ice forming.
Teams of rope access experts need to dangle from the top of the 207-metre concrete tower to use soap and water to wash down the sheaths that encase the steel strands.
The work started at the end of last month and will take up to six weeks to complete.
Ninety-six cables ranging in length from 94 to 420 metres will be cleaned – over 24 kilometres in total.
A 40mph speed limit is in force on the bridge for safety when rope access teams are working overhead, from Mondays to Fridays between 7am and 6pm.
The Queensferry Crossing has had to close to traffic in adverse weather three times since it opened in 2017, due to a risk of ice crashing on to vehicles below.
Since then, a team of engineers has been investigating potential measures to mitigate or prevent the problem.
They have identified dirt on the cables as a potential catalyst for the formation of ice.