Sadly, the only way to freshen up a bin that already smells is to wash it out. The quickest and most effective way to do this is to use a pressure washer.
Breathe new life into your outside spaces.How to pressure wash a wheelie bin
The easiest way to pressure wash a bin is to use one with a brush that you attach to the lance and that dispenses odour-neutralising, dirt-lifting detergent as you clean. These come in handy for cleaning a car, too. These accessories can sometimes be bought for entry-level pressure washers and are often supplied on more expensive models.
Although blasting the bin with the spray lance will get quick results, you run the risk of being drenched by filthy blast-back if the water pressure is too high. Turn the bin on its side first and use a variable spray lance on low power to loosen caked-on deposits. Empty the bin, then use a higher pressure to get it sparkling.
Other ways to clean a wheelie bin
If you don't have a pressure washer you could use a long-handled broom or mop to scrub your bin. Make the job easier by pouring a kettle of boiled water into the bin first and leaving it to steam for a few minutes to loosen the dirt.
Use a detergent to get rid of the smell. Stardrops, Jeyes Fluid and washing-up liquid are popular and effective choices for bin-cleaning.
Whatever you use, it's worth remembering not to tip the dirty water into a rainwater drain or you could contaminate local watercourses with detergent and unpleasant waste. Instead, pour it down your wastewater drain.
Learn how toKeeping your wheelie bin fresh
Some simple changes to the way you use your bin can help to keep it fresher for longer.
source https://www.which.co.uk/news/article/avoid-a-stinky-wheelie-bin-this-summer-ap3lY1E5SNzy