Comparative evidence

senh₂

• Hitt. sanh- 'seek, 'look for', 'investigate', 'attempt', 'avenge', 'look after, 'clean', 'sweep clean' (EDHIL: 720ff.). There is no need to assign the forms meaning to clean to a separate, homonymous verb sanh- 'clean', see CHD S: 162f. and EDHIL: 720ff.

References

EDHIL = Kloekhorst, A. 2008. Etymological Dictionary of the Hittite Inherited Lexicon. Brill.
CHD = Güterbock H.G., H.A. Hoffner, Th.P.J. van den Hout (eds.), 1980 - . The Hittite Dictionary of the Oriental Institute of the University of Chicago. Chicago.