This Nespresso Descaling Guide for Vertuo Line is well done.
I think Step 6 needs an edit. When I took more than 7 seconds between steps 4 and 6, I had to go back to step 4 and complete 4-6 within 7 seconds.
Step 6:
Press and hold the button until the light turns off and then starts blinking quickly again. Steps 5 and 6 must be completed within 45 seconds.
Should be:
Press and hold the button until the light turns off and then starts blinking quickly again. Steps 4 and 6 must be completed within 45 seconds.