Investors and promoters of Bengaluru-based facility management services provider Dusters Total Solutions have put up the company on sale. The company, which is backed by TVS Capital, is being valued at $45-50 million, said three people with direct knowledge of the development. TVS Shriram Growth Fund, a fund managed by TVS Capital, had invested Rs 58 crore in the company for a 51 per cent stake in two tranches in 2009 and 2010. The promoters, Shamsher Puri and Jasmer Puri, own rest of the stake in the company.