The Parkside patio cleaner might work. A guy on YouTube did a comparison of Karcher and Park side patio cleaners, and in reality there wasn't much difference, especially to justify the expense of the karcher.
Lidl were selling the parkside attachment 5yrs back for £15. On eBay they go for £30. Its rare but can you not use a 3rd party attachment with Parkside?
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A guy on YouTube did a comparison of Karcher and Park side patio cleaners, and in reality there wasn't much difference, especially to justify the expense of the karcher.