Foam bike wash - pressure washer attachment?

[ktmforever]

A while ago I saw a pic on the forum of a BMW 1200GS that is covered in foam during a wash.
Is this achieved with a pressure washer attachment, and which detergent is used?

 

[Nigel X]

 

[ktmforever]

 

[Rufus115]

 

[Nigel X]

 

[Bundu]

 

[Africa_Sam]

 

[ktmforever]

 

[elandsrider]

 

[2StrokeDan]

 

[Judge Dredd]

 

[armpump]

 

[ktmforever]

 

[Africa_Sam]