This point should be discussed between the parties ahead of the property transfer. If the buyer wishes to receive the property in a particular condition, they should mention it, and this can be specified in the deed of sale. In the absence of any specific instructions, common sense should prevail. Courtesy dictates that the seller leaves the property as they would like to find it themselves — empty and clean.
If the buyer plans to carry out major renovations immediately after the purchase, this should be confirmed in advance, in which case it may be acceptable to leave the property as is. Once again, good communication ahead of time will help avoid most potential issues.
Cleaning costs are, of course, the seller’s responsibility.
Excerpt from our guide: Selling Your Home in 42 Questions