Laravel 5 - sanitize certain inputs on validation

Is it possible to sanitize certain inputs on (or before validation)?

I have this rules for now (as example):

public function rules()
    {
        return [
            'name'        => 'required|min:3|max:255|string',
            'description' => 'string',
            'hours.*'     => ['required', new Hours],
        ];
    }

I want to sanitize name and description, but I don't to sanitize hours. Is this possible to do on validation, or I have to sanitize after validation and before insert?

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