My father often tells me to keep things clean.

Literal

Father [topic-は], often me [to-に], things [object-を] clean [in advance-ておく] [so that-ように] [quotative-と] says.

Three patterns interlock: きれいにしておく (keep clean — ておく marks maintaining a state), ~ようにと (indirect command marker), and 言う (says). The whole sentence reports a habitual instruction: 'tells me to maintain cleanliness.'