CCl4 is a non polar molecule because though each of the C-Cl bond is polar but the resultant of all these dipole moments is zero as its a symmetrical tetrahedral shape molecule ,and their is a cancellation of dipole moment in each pair
The chemical FORMULA for most dry cleaning fluid is Cl2C=CCl2,aka tetrachloroethylene, aka PERC. Alternative dry cleaning products include: hydrocarbon mixture such as DF-2000 and EcoSolv Dibutoxymethane - formula C3H8O2 Liquid silicone - formula [(CH3)2SiO]5. Brominated solvents - typical formula CH3CH2CH2Br. Supercritical or liquid Carbon Dioxide - formula CO2
The dot structure begins with two C atoms doubly bonded in the center. Each C atom then has a singly bonded H atom and Cl atom. The Cl atom has three pair of dots, one pair on each unbonded side.