If Phase-Doppler-Anemometry (PDA) is applied to analyze a spray of an optically inhomogeneous liquid a broad particle size distribution is measured. PDA is unsuitable for many applications. To overcome this problem we propose a deconvolution method using the measured size distribution from a droplet generator. The method is described and measurements are conducted on a milk spray and a water spray. The deconvoluted milk distribution compares well with the water distribution.