So, to re-phrase what I believe I read above, you cut your foot in South Africa and the wound was washed out. You are concerned that in this process you might have been infected with HIV. If I have summarized the events you describe properly, there is no risk to you from having had your wound cleaned. We get many questions about the possibility of HIV infection thought contact with open wounds. these questions, like your betrays a lack of understanding of how HIV is transmitted. Other than by sexual contact, HIV is transmitted when it is introduced by injection into tissue and, most often, the blood stream. This does not happen with open wounds in which the blood is flowing out of the body or in which something is used to clean a wound.
Bottom line, Zero risk. No reason for concern. No reason for testing. EWH
Just to add some rationality into the story to give you the better picture. From memory and friends accounts the chap looked healthy and didnt use any "tools" apart from a solution and some band aids.... plus he didnt have any visible cuts.