Octomom Holding A Bikini Car Wash

It's the Octomom's latest attempt to fix her house problems -- we're told Nadya plans to hold a bikini car wash fundraiser on June 18th in L.A. ... and she's inviting some well-known D-listers to help her out.

Among the bikini-clad ladies -- Charlie Sheen's porn star Capri Anderson, Tila Tequila ... and a whole mess of randoms like Reggie Bush's alleged mistress January Gessert, and Mel Gibson's alleged mistress Violet Kowal.