For the hydrocarbon base solvent, we select iso-octane (2,2,4-trimethylpentane) as a model for gasoline and cetane (n-hexadecane) to represent diesel, which have been used in previous MD simulations as single-component gasoline and diesel fuel surrogates. The model deposits are PAHs with no heteroatoms, such as the circumovalene molecule (C 66 H 20 ) that we use for most of the simulations, which is the largest PAH molecule identified in the experiments. We also perform a subset of simulations with smaller PAH molecules coronene (C 24 H 12 ) and hexa-cata-benzocoronene (C 48 H 24 ) to probe deposit size effects on the adsorption process.