To solve a problem that particularly the radiator for an engine in various machines for civil engineering and construction which is used in a construction field and is severely soiled to necessitate the frequent cleaning is usually close to the engine and mounted in a narrow place to make it difficult to insert the conventional lance with a nozzle attached to the tip into the narrow place and to be cleaned with the conventional lance.

In the lance 4 to be attached to a gun 3 for jetting a high pressure fluid which is attached to a hose 3 of each of various kinds of high pressure cleaning machines 1, the problem is solved by using a lance 5 for cleaning the narrow place in the high pressure cleaning machine. The lance 5 is provided with a plurality of small holes 7 perforated with an equal interval on the side surface of the tip part of the lance 4 and airtight cap 9 for sealing the tip of the lance 4.