This contribution presents two dimensional Monte-Carlo simulations of the local transport of hydrocarbons that are chemically eroded in the JET MkIIa divertor. The effect of a given background carbon flux flowing from the main plasma down to the divertor is taken also into account. The influence of local plasma temperatures and densities and the influence of different assumptions for the sticking of re-deposited particles hitting the tiles is analysed. Even under the assumption that the sticking of re-deposited hydrocarbon fragments is zero, a large amount (about 75%) of the eroded particles is re-deposited in form of ionised carbon on the tiles. A reasonable agreement between the simulation and the experimental observation of the carbon deposition at the inner louvres in the MkIIa JET divertor is achieved, if high chemical erosion yields of about 20% together with a negligible effective sticking of hydrocarbons is assumed. Although there are experimental observations indicating similar high erosion yields, such high erosion yields can not be applied as a stationary value for the effective erosion since it would turn the inner divertor into a net erosion area in contrast to the experimental findings. Therefore the influence of the chemical erosion induced by low energy deuterium atoms in addition to the erosion due to ions is considered. The possibility of applying different erosion rates for (re-) deposited layers and the substrate material is discussed. First conclusions concerning the erosion and re-deposition behaviour in ITER will be drawn.