the 105 has a cleaner...but not a strong cleaner..enough to clean fallout..and grime..not LSP...also has more polymers and acrylics in it...more durable....it will take over 111 in time..
105 is layerable.... the cleaner will not remove a new lsp...will clean any decaying lsp..one that has reached its end...cleans surface for a better bond...
plus has ingredients to work better with the bonding agent...
Al