Good job tying it down - that is probably why our scraper didn't help - it was hard to hold still AND scrape without falling ova !
So we found that 3 things did a better job - for us:
1) a small rug on the ground by the steps (better if we put the 9'x12' one out, but don't usually )
2) the step rug on the first step only since it messes with the step sensor on the 2nd step,
3) a 2x3 rug at the top of the stairs inside to catch the last of it