Hello , I would remove the rack , sand off the polyurathane finish & treat bare wood with boiled linseed oil . You could even apply a wood stain before the oil to alter its colour if you wished .
You simply pour some oil into a rag & rub onto wood until it is absorbed , repeat as often as you feel necessary
One word of advice , DO NOT leave any cloth used to apply the oil scrunched up as it can auto ignite ,
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