Cleaning and eating a dropped morsel

Our Prophet - may he be blessed - has also instructed us that if we accidentally drop a morsel on the ground. It should be picked up, even washed if needed, and eaten. Jabir has related the following Prophetic saying:

"When anyone of you drops a morsel, he should clean it of any unwanted accretion and eat it and should not leave it for Satan. Then upon finishing, he should lick his fingers as he knows not which part of it is beneficial for him." (Sahih Muslim)

According to this hadith, disrespect for food and drink is a Satanic act, and eating a dropped morsel is a respectful act, which shall surely earn merit and reward and one must not feel ashamed of it. However, if to clean it is impossible, then it is quite another matter.